IGN-A Fuse Keeps Blowing

[nimrod.sixty9]

Need help tracking down a short as IGN-A fuse keeps popping the second I turn the ignition to crank.

My Chiltons manual says its good for model years up to 98 (says the same for the engine schematic). Can someone with a Haynes or another manual check me?
Im showing positive cable (red) to 40 amp fuse > ignition switch (red) > neutral switch (yellow) > starter solenoid (purple).

Any ides or tips appreciated.

1999 Yukon SLT

 

[nimrod.sixty9]

I pulled the plastic cover off of the steering column and traced the lines I could see. Looked very closely at any point that rubs when the steering column is tilted; all looked good.

According to Haynes, the line I should be looking for goes to the fuse and to the starter relay. Am I right?

Problem is, there are quite a lot more wires coming out of the ignition switch; five to be exact. Then they all go to a black box just next to the switch and out down the column.

Anyone with Alldata? Any other ideas?

 

[lesterl]

Pull the purple wire off the starter and see if it blows. If it doesnt blow now you have a bad starter.... If it still blows, trackback from there.....

 

[nimrod.sixty9]

Pull the purple wire off the starter and see if it blows. If it doesnt blow now you have a bad starter.... If it still blows, trackback from there.....

I wish I had seen this post before I ran though all my fuses. And the started is covered in oil.

I followed the line from the starter to the wire loom that's at the back of the block. Opened the entire fuse panel (even the back). Took (broke) off the plastic around the column, and inspected all wires there. All looked new... So Im thinking starter too.

Prob going to the JYard tomorrow and get a couple of starters and a ton of fuses.

One thing that gets me though; my fuse fails at run, not crank. Or simply fails before I even get to crank. Possible to have a short inside of the solenoid?

 

[Slammed]

Is there a factory fuel cut off switch on these? If so I'd check that too

 

[lesterl]

If it fails before crank, then it isnt the starter. Check the white feed to the transmission and the Pink feed to the other fuses..... You can use a headlight in place of the fuse (since it is such a large fuse we need a large light, might have to wire a couple in parallel to get enough current capacity so as to not light it reguardless.... If you have a digital multimeter, unplug the ign switch and ohm the white and pink wires to ground, you will find a dead short pretty quick, which is what you have.....